1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    *
5    *
6    *
7    * The contents of this file are subject to the terms of the Liferay Enterprise
8    * Subscription License ("License"). You may not use this file except in
9    * compliance with the License. You can obtain a copy of the License by
10   * contacting Liferay, Inc. See the License for the specific language governing
11   * permissions and limitations under the License, including but not limited to
12   * distribution rights of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.portal.dao.orm.hibernate;
24  
25  /**
26   * <a href="DB2Dialect.java.html"><b><i>View Source</i></b></a>
27   *
28   * @author Shepherd Ching
29   * @author Jian Cao
30   */
31  public class DB2Dialect extends org.hibernate.dialect.DB2Dialect {
32  
33      public String getLimitString(String sql, boolean hasOffset) {
34          if (!sql.startsWith("(")) {
35              return super.getLimitString(sql, hasOffset);
36          }
37  
38          StringBuilder sb = new StringBuilder();
39  
40          sb.append("select cursor1.* from (");
41          sb.append("select rownumber() over() as rownumber_, cursor2.* from (");
42          sb.append(sql);
43          sb.append(") as cursor2) as cursor1 where rownumber_");
44  
45          if (hasOffset) {
46              sb.append(" between ? + 1 and ?");
47          }
48          else {
49              sb.append(" <= ?");
50          }
51  
52          return sb.toString();
53      }
54  
55  }